Effectiveness of orchard heaters effectivenessofo0723kepn Year: 1951 Table 1 .—Relative Temperatures at Various Soil Depths and In the Air Above the Soil Unheated temperatures, ° F. in or under tree center at center of tree space Air temp. 5 ft. above ground Air temp. 3 in. above ground Soil surface temp Soil temp., 2 in. below surface Soil temp., 6 in. below surface Soil temp., 12 in. below surface Radiant energy from heaters. In considering the effect of the radiant en- ergy which a heater develops, it is neces- sary to determine

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Effectiveness of orchard heaters effectivenessofo0723kepn Year: 1951 Table 1 .—Relative Temperatures at Various Soil Depths and In the Air Above the Soil Unheated temperatures, ° F. in or under tree center at center of tree space Air temp. 5 ft. above ground Air temp. 3 in. above ground Soil surface temp Soil temp., 2 in. below surface Soil temp., 6 in. below surface Soil temp., 12 in. below surface Radiant energy from heaters. In considering the effect of the radiant en- ergy which a heater develops, it is neces- sary to determine both the total radiant output, and the distribution of this output in relation to vertical angle. This was ac- complished in the laboratories at Davis

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